Well I guess that the "system" is more simple than you think.
Imagine a painting hanging on a wall on one nail. The string is attached to the backside of the frame and is hold by the nail in the middle, the whole thing is not visible.
My system : The string is longer and is hanging over two nails in the front side of the board. If the painting 17" wide the two nails is also put in at 17" between each other to secure the nylon (Fish line or white string) to be parallel. Looks better than the triangle from the one-nail-system.
When you hang a new painting, you attach the string in one side of the painting and attach the other end temporarily to the other side, then hang the painting on the two nails and adjust hight and level with the one end of the string. It works for me and I find it easier than any two string systems.
The nails should be put in the board at an angle pointing a little upward.
The board should be attach to the wall with screws that make it easy to remove later.
Allan
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